348 MR. H.W. BATES ON FORMOSAN COLEOPTKRA. [June 12, 



acutis, supra lituris parvis curvatis i?npresso, lateribus rugosis; 

 mandibulis brevibus, intus bidentatis, supra cornu suberecto 

 curvato obtuso armatis, dense foveolatis ; thorace lateribus 

 medio emarginatis, supra passim punctata; ehjtris prcesertim 

 dorso minus profunde sulcatis, sulcis fundo serie puncturum 

 ocellarium impressis, interstitiis punctulatis. 

 Long. (mand. excl.) G lin., maud. \ lin. 



Much more slender and proportionally narrower than N. Icevicollis; 

 head very similar in shape, but the lateral dilatation not so much 

 prolonged or retrocurved, the hind edge from the acute apex being 

 transverse to the axis of the body ; surface of the head covered with 

 small semicircular impressions ; mandibles thickly, coarsely, and 

 deeply pitted ; the dorsal apophysis is directed obliquely forward, 

 curved inwards, and obtuse at the apex. The sulci of the elytra are 

 wide and shallow towards the suture, the fovese in their bottoms are 

 ocellated and distinct one from the other ; the sides of the interstices 

 have a row of fine punctures. 



The other species of Lucanidce are : — 



Odontolabjs carinatus, Linn. 

 A Silhet or North-east Indian insect. 



Cladognathtjs inclinatus, Motschoulsky. 

 Hitherto known only from Japan. 



EuRYTRACHELUS PLATYMELUS, Saund. 



A Chinese species. 



Serricornes. 



Lacon formosanus. 



L. bipapulato simil/imus quoad formam et colorem ; thorace an- 

 tice latiore mayis rotundato, ante basin magissinuato angulisque 

 posticis productis quasi lobatis; corpore toto brunneo, tomento 

 fulvo-brunneo plagiatim vestito; capite thoraceque grosse crebre 

 punctatis ; ehjtris grosse striato-punctatis, interstitiis crebre 

 punctulatis. 

 Long. 8| lin. 



Much resembling L. bipapulatus (Candeze, Monogr. Elaterid. 

 Suppl. p. 11), a Chinese species, and differing almost solely in the 

 form of the thorax, which is more rounded on the sides anteriorly, 

 more sinuated towards the base, with the hind angles more pro- 

 duced; the latter form almost lobular projections, truncated at their 

 apices. 



Lacon setiger. 



Elongatus, postice subabrupte attenuatus, corpore supra setis 

 brevibus erectis brunneis dense vestito ; capite grosse et pro- 

 funde punctato, nlgro, fulvo squamoso ; antennis rufis, articulis 

 quatuor basalibus piceo-nigris, articulis 2° et 3° subcequalibus 



